Internal DVD burner for Inspiron 5100?

Hi, I've scanned hundreds of posts on this topic, but can't find a satisfactory answer.

I have an Inspiron 5100, which came installed with the CD RW/DVD Combo Drive. I'd like to purchase an internal DVD+RW burner, but Dell doesn't seem to sell them anymore. I've looked on several websites and can find numerous such drives (from Sony, NEC, Memorex, etc), but obviously I want it to be compatible with my 5100. How can I tell in advance whether a drive will fit? Most of the model specs I've seen don't mention compatibility, only that the connectivity is EIDE or IDE. Any help is much appreciated. Thanks!